Re: [dpdk-dev] lost when learning how to test dpdk

[Jan Viktorin <viktorin@rehivetech.com>]

Hi,

thanks for reply. I could see those docs but it does not help me a lot.
I still do not understand very well the principle of the tool. How it
chooses the NICs to use? Previously I confused -b in dpdk_nic_bind and
testpmd. They have somehow opposite meaning. I can start testpmd now,
however, it does ot probe any NIC. I've tried -w to whitelist certain
NICs but with no success.

$ dpdk_nic_bind --status

Network devices using DPDK-compatible driver
============================================
0000:03:00.0 '82545GM Gigabit Ethernet Controller' drv=uio_pci_generic unused=e1000
0000:03:02.0 '82545GM Gigabit Ethernet Controller' drv=uio_pci_generic unused=e1000

Network devices using kernel driver
===================================
0000:00:19.0 'Ethernet Connection I217-V' if=eno1 drv=e1000e unused=uio_pci_generic *Active*

Other network devices
=====================
<none>

$ sudo testpmd -c 0x3 -n 2 -- -i --total-num-mbufs=2048
EAL: Detected lcore 0 as core 0 on socket 0
EAL: Detected lcore 1 as core 1 on socket 0
EAL: Detected lcore 2 as core 0 on socket 0
EAL: Detected lcore 3 as core 1 on socket 0
EAL: Support maximum 128 logical core(s) by configuration.
EAL: Detected 4 lcore(s)
EAL: VFIO modules not all loaded, skip VFIO support...
EAL: Setting up physically contiguous memory...
EAL: Ask a virtual area of 0x3c00000 bytes
EAL: Virtual area found at 0x7fe973e00000 (size = 0x3c00000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe973a00000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe973600000 (size = 0x200000)
EAL: Ask a virtual area of 0x3c00000 bytes
EAL: Virtual area found at 0x7fe96f800000 (size = 0x3c00000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe96f400000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe96f000000 (size = 0x200000)
EAL: Requesting 64 pages of size 2MB from socket 0
EAL: TSC frequency is ~3699998 KHz
EAL: Master lcore 0 is ready (tid=7989d8c0;cpuset=[0])
EAL: lcore 1 is ready (tid=6efff700;cpuset=[1])
EAL: No probed ethernet devices
Interactive-mode selected
Done
testpmd>

Thanks
Jan Viktorin

On Wed, 29 Jul 2015 12:09:06 +0300
ciprian.barbu <ciprian.barbu@enea.com> wrote:

> 
> 
> On 28.07.2015 21:13, Jan Viktorin wrote:
> > Hello all,
> >
> > I am learning how to measure throughput with dpdk. I have 4 cores
> > Intel(R) Core(TM) i3-4360 CPU @ 3.70GHz and two 82545GM NICs connected
> > together. I do not understand very well, how to setup testpmd.
> 
> http://dpdk.org/doc
> http://dpdk.org/doc/guides/testpmd_app_ug/run_app.html
> http://dpdk.org/doc/quick-start
> 
> >
> > I've successfully bound the NICs to dpdk:
> >
> > $ dpdk_nic_bind --status
> >
> > Network devices using DPDK-compatible driver
> > ============================================
> > 0000:03:00.0 '82545GM Gigabit Ethernet Controller' drv=uio_pci_generic unused=e1000
> > 0000:03:02.0 '82545GM Gigabit Ethernet Controller' drv=uio_pci_generic unused=e1000
> >
> > Network devices using kernel driver
> > ===================================
> > 0000:00:19.0 'Ethernet Connection I217-V' if=eno1 drv=e1000e unused=uio_pci_generic *Active*
> >
> > Other network devices
> > =====================
> > <none>
> >
> > and then I tried to run testpmd:
> >
> > sudo ./testpmd -b 0000:03:00.0 -b 0000:03:02.0 -c 0xf -n2 -- --nb-cores=1 --nb-ports=0 --rxd=2048 --txd=2048 --mbcache=512 --burst=512
> 
> http://dpdk.org/doc/guides/testpmd_app_ug/run_app.html#testpmd-command-line-options
> 
> The -b option black lists your PCI devices, you don't need those. The 
> --nb-ports is of course the number of ports, it cannot be 0.
> 
> > ...
> > EAL: Ask a virtual area of 0x400000 bytes
> > EAL: Virtual area found at 0x7f1549800000 (size = 0x400000)
> > EAL: Requesting 1024 pages of size 2MB from socket 0
> > EAL: TSC frequency is ~3699999 KHz
> > EAL: Master lcore 0 is ready (tid=de94a8c0;cpuset=[0])
> > EAL: lcore 2 is ready (tid=487fd700;cpuset=[2])
> > EAL: lcore 3 is ready (tid=47ffc700;cpuset=[3])
> > EAL: lcore 1 is ready (tid=48ffe700;cpuset=[1])
> > EAL: No probed ethernet devices
> > EAL: Error - exiting with code: 1
> >    Cause: Invalid port 0
> >
> > I tried --nb-ports={0,1,2} but neither of them works. BTW, what does this option it mean? :)
> > I could not find any description in the docs nor in the help (maybe I've omitted something).
> >
> >
> > Well, if I manage the testpmd to work I need a packet generator, right? I've downloaded
> > the dpdk-pktgen. And I am lost again. How can I start it?
> >
> > After several attempts (mostly trying to use the pktgen-master/slave.sh, what is
> > their purpose?), the most "successful" output was:
> >
> > ...
> > EAL: Detected lcore 0 as core 0 on socket 03 handles port 1 rx & core 4 handles port 0-7 tx
> > EAL: Detected lcore 1 as core 1 on socket 0 as it does not matter to the syntax.
> > EAL: Detected lcore 2 as core 0 on socket 0
> > EAL: Detected lcore 3 as core 1 on socket 0p/app/x86_64-native-linuxapp-gcc (master *%=)
> > EAL: Support maximum 128 logical core(s) by configuration.
> > EAL: Detected 4 lcore(s)
> > EAL: No free hugepages reported in hugepages-2048kB
> 
> You either don't have hugepages or there aren't any free left.
> 
> > PANIC in rte_eal_init():
> > Cannot get hugepage information
> > 6: [./pktgen(_start+0x29) [0x41abc9]]
> > 5: [/usr/lib/libc.so.6(__libc_start_main+0xf0) [0x7f93eadcc790]]
> > 4: [./pktgen(main+0x140) [0x419d80]]
> > 3: [./pktgen(rte_eal_init+0xd2b) [0x4bb8bb]]
> > 2: [./pktgen(__rte_panic+0xc9) [0x419ae5]]
> > 1: [./pktgen(rte_dump_stack+0x16) [0x4c3946]]
> > Aborted (core dumped)
> >
> > I'd like to run a simple scenario, just sending packets from one NIC to the other (or
> > something similar) and measure the throughput. Could you please help me?
> >
> > Regards
> > Jan Viktorin
> >



-- 
   Jan Viktorin                  E-mail: Viktorin@RehiveTech.com
   System Architect              Web:    www.RehiveTech.com
   RehiveTech
   Brno, Czech Republic